georefid:1998-057327SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=1998-057327Dynamics of Chesapeake Bay impact revealed by upper Eocene ejecta deposition on the New Jersey continental margin1997-01-01publicationgeorefid:1998-057327
McHugh, Cecilia M. G.City University of New York, Queens College, Geology Department, Flushing, NY, United StatesauthorPaterson, TaraTownsend High School, United StatesauthorSnyder, Scott W.East Carolina University, United StatesauthorMiller, Kenneth G.Rutgers University, United StatesauthorGeological Society of America (GSA), Boulder, CO, United StatespublisherdocumentHardcopyIn: Anonymous, Geological Society of America, 1997 annual meeting29 (6)79Evidence for the Chesapeake Bay bolide impact, now recognized as the source for the North American Strewn Field, is provided by an upper Eocene ejecta deposit that occurs on the New Jersey continental margin at Ocean Drilling Program (ODP) Sites 904 and 903. The mineralogy, major oxide composition of fine-grained tektites and coarse-grained unmelted ejecta materials, and biostratigraphic age of the enclosing sediments link the origin of these ejecta to the Chesapeake Bay impact crater, located only 300 km away. The sediment associated with the ejecta provides new and important information about the dynamics of impact events. The 35-cm-thick ejecta-bearing layer can be subdivided into three subunits that indicate a sequence of events: 1) sediment failure, 2) deposition of gravel-sized fragments, 3) deposition of abundant sand-sized ejecta by gravity settling, and 4) accumulation of a 12-cm-thick sedimentary deposit containing rare silt-sized tektites and evidence of waning currents. These events are interpreted by linking sediment deposition to seismic ground motion and subsequent tsunami waves triggered by both the Chesapeake Bay impact and slope failures.completedGeomorphologyStratigraphyAtlantic Coastal PlainbolidesCenozoicChesapeake Bay impact structurecontinental marginearthquakesejectaEocenefailuresground motionimpact featuresLeg 150meteorsmineral compositionNew JerseyOcean Drilling ProgramODP Site 903ODP Site 904PaleogenesedimentationtektitesTertiarytsunamisUnited Statesupper Eoceneurn:org.iodp:exp:150
urnlargerWorkCitationcampaignurn:org.iodp:exp:150:site:903
urnlargerWorkCitationstudyurn:org.iodp:exp:150
urnlargerWorkCitationcampaignurn:org.iodp:exp:150:site:904
urnlargerWorkCitationstudyurn:org.iodp:exp:150
urnlargerWorkCitationcampaignEnglishgeoscientificInformation-72.4902-72.460538.514838.5618